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C730 cube power issue

2019-02-10, 16:27 PM

I have had this C730 for a few months now and have called customer support before. 


The cube goes to sleep fine etc, but every 5 times or so, it will not turn back on. Supposedly they did a BIOS update, and the problem appeared better. But on Friday, the PC went to sleep mode and never would return to life. I shut it down manually, and now there is no response whatsoever from the power button. This has happened before and it would randomly come on, but for 3 days now, no response.

 

I have not been able to find any problems online like I have. If you have any ideas....

 

Thanks

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17 Posts

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Re: C730 cube power issue

2019-02-10, 17:54 PM
I never had this problem before upgrading my bios to the latest version from the homepage. But after that, it happens quite often.

My computer sleeps 7-10 times during a normal day, I use it for small tasks during they day.
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Re: C730 cube power issue

2019-02-10, 17:57 PM

UPDATE:

 

Pulled the side cover off to see if the power supply unit was operating properly as well as the power button. 

 

When I turn the power on via the power button, the back two fans spin momentarily, but, nothing else happens. So the machine does not turn on, but there is power getting to the fans at least momentarily. I am assuming at this point that the supply unit is bad. I work off this machine, so sitting out without one while warranty is done is not really something I want to have to deal with. But, so it is. 

 

 

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Re: C730 cube power issue

2019-02-10, 18:21 PM

You seem to have a different problem than me.

Once every few times mine wakes up - i get the default colour in the LEDs, a few spins of the fans - an no output to the monitor.

 

The light doesn't change colour - which indicates that the machine never gets through 'post'.

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Re: C730 cube power issue

2019-02-10, 18:25 PM

I see.

 

My issue is basically dead stick. The cube lights don't illuminate at all. So the machine never gets going. This problem is the worst I have had. Previously, the PC would just stay in sleep mode, unresponsive to the power button. So I had to turn off manually. 

 

This current issue is no response whatsoever. Almost like it is bricked. 

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9 Posts

01-16-2019

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Re: C730 cube power issue

2019-02-18, 2:02 AM

I'm having a similar problem with my Y720 Cube.  It goes to sleep fine.  Monitor, mouse, keyboard, and cube go 'dark' except the illuminated power button blinks.  This is normal for a sleeping computer.  The USB ports stay powered.  My phone or tablet will still charge.  All is normal as best I can tell.

 

The proble is when I try to wake it.  I used to wake it with the mouse or keyboard, but now that doesn't work.  When I click the mouse or keyboard, the lights inside the case, and the "Y" on the front flash, the the computer goes completely dark.  The power button goes dark, no longer flashing.  The USB ports go unpowered and the phone or tablet say no longer charging.  The only way to wake it from sleep is to push the power button for 1-2 seconds. 

 

This problem only started after I changed the power supply.  The original 450w PSU that came with it crashed when playing games at 1440p.  The problem was definately a PSU problem, and could be recreated at will.  I purchased an EVGA 450w PSU and installed it.  BTW: I've been building custom gaming rigs for years, so I have some experience in swapping PSUs.  The crashing problem was resolved completely, but this wake w/ keyboard problem started around the same time.  I thought it might be the PSU, so I swapped it for a 650w Corsaire PSU but the problem continues.  I can't find any setting in the bios or Win10 settings that can resolve it.  Any thoughts?

 

Claude

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Re: C730 cube power issue

2019-02-18, 2:42 AM
I found out that disabling the onboard Realtek sound card, causes the PC to not wake up properly. I disabled it, after upgrading the UEFI, since i don't use the onboard soundcard.

After re-enabling it, my problem went away.

Still really bummed over the noise this PC makes.
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Re: C730 cube power issue

2019-02-18, 22:58 PM

I hear you on the PSU issue. I thought about just buying a higher output unit, but decided instead to just warranty the machine. Sucks, workst week for both work and home play for this to happen. Lenovo has always had great customer service, just bites to have to ship and wait. 

 

I really think the PSU should be powerful enough at 450w output, but maybe not. Does BIOS need to be updated with a better PSU?

 

Thanks for the info. I will see what they end up finding as issue outside of the PSU, if anything. 

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Re: C730 cube power issue

2019-02-19, 1:22 AM

I don't think I'm the only one who had to replace or upgrade the PSU to stop random crashing in demanding games.  The bios does not need to be upgraded, I just like to always be on the newest bios.  The way I see it, they don't right them for the fun of it, so if they made it, it must be needed.  I thought 'maybe' the PSU might be causing a problem that was preventing me from updating the bios, but that was not the case.  

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Re: C730 cube power issue

2019-06-19, 0:41 AM

The PSU problem was solved when I got a Haswell certified compatible PSU.  Stable, no crashes, and no wake up problems.  I tried several PSUs that were supposed to be compatible, but I had to find one that was Haswell certified.

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